content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  
  import com.google.protobuf.conformance.Conformance;
  import com.google.protobuf.InvalidProtocolBufferException;
  
  class ConformanceJavaLite {
    private int testCount = 0;
  
    private boolean readFromStdin(byte[] buf, int len) throws Exception {
      int ofs = 0;
      while (len > 0) {
        int read = System.in.read(buf, ofs, len);
        if (read == -1) {
          return false;  // EOF
        }
        ofs += read;
        len -= read;
      }
  
      return true;
    }
  
    private void writeToStdout(byte[] buf) throws Exception {
      System.out.write(buf);
    }
  
    // Returns -1 on EOF (the actual values will always be positive).
    private int readLittleEndianIntFromStdin() throws Exception {
      byte[] buf = new byte[4];
      if (!readFromStdin(buf, 4)) {
        return -1;
      }
      return (buf[0] & 0xff)
          | ((buf[1] & 0xff) << 8)
          | ((buf[2] & 0xff) << 16)
          | ((buf[3] & 0xff) << 24);
    }
  
    private void writeLittleEndianIntToStdout(int val) throws Exception {
      byte[] buf = new byte[4];
      buf[0] = (byte)val;
      buf[1] = (byte)(val >> 8);
      buf[2] = (byte)(val >> 16);
      buf[3] = (byte)(val >> 24);
      writeToStdout(buf);
    }
  
    private Conformance.ConformanceResponse doTest(Conformance.ConformanceRequest request) {
      Conformance.TestAllTypes testMessage;
  
      switch (request.getPayloadCase()) {
        case PROTOBUF_PAYLOAD: {
          try {
            testMessage = Conformance.TestAllTypes.parseFrom(request.getProtobufPayload());
          } catch (InvalidProtocolBufferException e) {
            return Conformance.ConformanceResponse.newBuilder().setParseError(e.getMessage()).build();
          }
          break;
        }
        case JSON_PAYLOAD: {
          return Conformance.ConformanceResponse.newBuilder().setSkipped(
              "Lite runtime does not support JSON format.").build();
        }
        case PAYLOAD_NOT_SET: {
          throw new RuntimeException("Request didn't have payload.");
        }
  
        default: {
          throw new RuntimeException("Unexpected payload case.");
        }
      }
  
      switch (request.getRequestedOutputFormat()) {
        case UNSPECIFIED:
          throw new RuntimeException("Unspecified output format.");
  
        case PROTOBUF:
          return Conformance.ConformanceResponse.newBuilder().setProtobufPayload(testMessage.toByteString()).build();
  
        case JSON:
          return Conformance.ConformanceResponse.newBuilder().setSkipped(
              "Lite runtime does not support JSON format.").build();
  
        default: {
          throw new RuntimeException("Unexpected request output.");
        }
      }
    }
  
    private boolean doTestIo() throws Exception {
      int bytes = readLittleEndianIntFromStdin();
  
      if (bytes == -1) {
        return false;  // EOF
      }
  
      byte[] serializedInput = new byte[bytes];
  
      if (!readFromStdin(serializedInput, bytes)) {
        throw new RuntimeException("Unexpected EOF from test program.");
      }
  
      Conformance.ConformanceRequest request =
          Conformance.ConformanceRequest.parseFrom(serializedInput);
      Conformance.ConformanceResponse response = doTest(request);
      byte[] serializedOutput = response.toByteArray();
  
      writeLittleEndianIntToStdout(serializedOutput.length);
      writeToStdout(serializedOutput);
  
      return true;
    }
  
    public void run() throws Exception {
      while (doTestIo()) {
        this.testCount++;
      }
  
      System.err.println("ConformanceJavaLite: received EOF from test runner after " +
          this.testCount + " tests");
    }
  
    public static void main(String[] args) throws Exception {
      new ConformanceJavaLite().run();
    }
  }
  